Zinc Alloys


Also found in: Dictionary, Thesaurus, Medical.
Related to Zinc Alloys: ZAMAK
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Zinc Alloys

 

zinc-base alloys containing mainly aluminum, copper, or magnesium (see Table 1). Zinc alloys are characterized by a low melting point and good flowability; they are readily worked by pressure and cutting and are easily welded and soldered. Metallic and nonmetallic coatings can be deposited by electrochemical and chemical methods on products made of zinc alloys. The corrosion resistance of the alloys is about the same as that of commercial zinc and galvanized steel. The disadvantages of zinc alloys are their poor mechanical properties at elevated temperatures (particularly resistance to creep), the tendency to alter dimensions in the course of natural aging, and the poor corrosion resistance in corrosive acidic and alkaline media.

Table 1. Chemical composition and uses of zinc alloys
Composition1 (percent by weight)Uses
AlCuMg 
1The rest is zinc
3.5–4.30.02–0.06For products cast under pressure
3.5–4.50.6–1.20.02–0.06 
9–124–5.50.03–0.06For bearings
8–111–20.03–0.06 
0.8–1.20.01For products obtained by rolling, stamping, and deep drawing
0.06–0.600.0.1–0.06 
3.5–4.50–3.50.02–0.10 
22Upto 1Upto 0.1For products of complicated shape obtained by pneumatic forming in a superplastic state

The most common zinc alloys are those used in pressure die casting to produce structural and decorative components of motor vehicles, electrical machines, office machinery, household appliances, souvenirs, and other objects. Compared with other alloys used in pressure die casting, zinc alloys are more practical and permit thin-walled castings to be obtained. They are used as antifriction materials in bearing linings (cast, compressed, and bimetallic types); they are good alternatives for the tin-bronzes and the low-tin Babbitt metals.

Zinc alloys that are worked under pressure in the form of rolled sheets are used in various branches of technology for the manufacture of products by deep stamping or pneumatic forming in a superplastic state; they are also used in the printing industry (zincography). Stamping and forming dies for aluminum alloys are produced from thick rolled plates. Rolled semifinished products made from zinc alloys exhibit pronounced anisotropic properties.

REFERENCE

Spravochnik po mashinostroitel’nym materialam, vol. 2: Tsvetnye metally i ikh splavy. Moscow, 1959.

I. L. ROGEL’BERG

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Kalantary, "Zinc alloy electrodeposition for corrosion protection," Plating and Surface Finishing, vol.
* workpiece material was plates of zinc alloy ZnAl4Cu1T;
(13) Kalantary, M.R., "Zinc Alloy Electro Deposition for Corrosion Protection," Plat.
Zinc alloys can be used to die cast extremely small, complex shapes.
However, changes in the aluminum and magnesium content of zinc alloys can affect other factors that determine surface finish--die temperature, metal temperature at the end of the cavity fill, fill time, fill pattern and gate speed.
Coventya are a major international supply house and are particularly experienced in processes for enhanced corrosion resistance and torque tension characteristics as topcoats on zinc and zinc alloys. They already have many automotive approvals for their systems and are at the forefront in these technologies.
According to Mr Stevens, the investment means the firm is now poised to become the largest sub-contract plater in zinc alloys in Europe.
To develop new zinc alloys for thin section diecasting, a commercial zinc alloy was modified by increasing its aluminum content.
All AmGard modules are ingress protected to IP67 and are constructed using stainless steel and zinc alloys for trouble-free operation.
Currently, the two zinc alloys most prominent in applications are the Zamak family, which dates back to the 1930s, and the ZA family, which was created in the 1970s.